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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ebc7cb7c16fe04e39a206ff0ea1733efcf0e7a519aebb1b7cba2c3ce3259a2b' 
  AND token = '1+GCvqDxb0G0vqHAL9zhTI3EcTHfcgeQyIdgtw4T544=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}